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Learn a Fact: 1 x 4

1
0
x  2
2
6
x  0
3
4
x  0
4
1
x  5
5
0
x  8
6
9
x  0
7
1
x  1
8
7
x  1
9
4
x  1
10
1
x  9
11
1
x  3
12
1
x  0
13
1
x  8
14
3
x  0
15
7
x  0
16
2
x  1
17
6
x  1
18
0
x  5

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4

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